caps lock
There is usually a capital lock key on the computer keyboard, which can be pressed to switch between uppercase and lowercase letters. When the uppercase lock key is pressed, all letters on the keyboard will be entered in uppercase.
shift key
When entering letters, hold down the Shift key and then press the letter key to enter the corresponding capital letters. For example, holding down the Shift key and then pressing the letter "A" key will input the capital letter "A".
Change the case of letters
In some text editors or processors, you can change the case of letters by selecting the letters you want to change the case, and using options such as "Convert Case" in the menu bar.
keyboard shortcuts
Some software programs may provide specific shortcut keys to change the case of letters. You can find relevant information in the help documents or settings of this software program.